Been meaning to sort this for ages (years, I suspect). You used to be able to put contexts & projects in the subject line when forwarding an email to OF. Has that gone? Google & the Omni forums makes me think it might have. Wasn’t that useful to me when I first started with OF but now…
Thanks, team!
You’re referring to:
https://support.omnigroup.com/omnifocus-2-mail-rule/
This is indeed not officially supported anymore, and Mail Drop does not support any further specific syntax as far as I know.